echo "Caught SIGTERM signal!"
kill -TERM "$child" 2>/dev/null
trap _term SIGTERM
echo "Doing some initial work...";
/bin/start/main/server --nodaemon &
bash will ignore any signals while a child process is executing. Starting the server with
& will background it into the shell's job control system, with
$! holding the server's PID (to be used with
wait will then wait for the job with the specified PID (the server) to finish, or for any signals to be fired.
When the shell receives
SIGTERM (or the server exits independently), the
wait call will return (exiting with the server's exit code, or with the signal number + 128 in case a signal was received). Afterward, if the shell received SIGTERM, it will call the
_term function specified as the SIGTERM trap handler before exiting (in which we do any cleanup and manually propagate the signal to the server process using